Download 1998 Cadillac Catera Oil Cooler Service Manual – 1. Raise and support the vehicle. 2. Drain the engine oil and remove the oil filter housing. 3. Loosen the oil cooler outlet (1) and the inlet (2) lines from engine block. See Fig. 16 . 4. Lower the vehicle. 5. Remove the intake plenum. See INTAKE PLENUM . 6. Remove the intake manifold. See INTAKE MANIFOLD & SPACER . 7. Disconnect the following electrical connectors from the water crossover: The engine coolant temperature sender (2). The engine coolant temperature sensor (4). See Fig. 17 . 8. Remove the water crossover bolts (1). 9. Remove the water crossover upper and lower seals (2). See Fig. 18 . 10. Loosen the upper heat shield bolts on the left side of the exhaust manifold. See Fig. 19 . 11. Remove the oil cooler outlet line from the engine oil cooler. See Fig. 20 . 12. Remove the oil cooler inlet line from the engine oil cooler. 13. Note the positioning of the 4 seals. See Fig. 21 . 14. Position oil feed and return lines aside and secure with mechanic wire. 15. Remove the engine oil cooler inlet and outlet nuts (1). See Fig. 22 . 16. Remove the engine oil cooler cover bolts (2). 17. Remove the engine oil cooler cover. 18. Remove the engine oil cooler. 19. Clean all sealing surfaces.